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Tom Rini10e47792018-05-06 17:58:06 -04001// SPDX-License-Identifier: GPL-2.0+
wdenk9c53f402003-10-15 23:53:47 +00002/*
Stefan Roese88fbf932010-04-15 16:07:28 +02003 * linux/arch/powerpc/kernel/traps.c
wdenk9c53f402003-10-15 23:53:47 +00004 *
Andy Flemingf08233c2007-08-14 01:34:21 -05005 * Copyright 2007 Freescale Semiconductor.
wdenk9c53f402003-10-15 23:53:47 +00006 * Copyright (C) 2003 Motorola
7 * Modified by Xianghua Xiao(x.xiao@motorola.com)
8 *
9 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
10 *
11 * Modified by Cort Dougan (cort@cs.nmt.edu)
12 * and Paul Mackerras (paulus@cs.anu.edu.au)
13 *
14 * (C) Copyright 2000
15 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
wdenk9c53f402003-10-15 23:53:47 +000016 */
17
18/*
19 * This file handles the architecture-dependent parts of hardware exceptions
20 */
21
22#include <common.h>
Simon Glass6b9f0102020-05-10 11:40:06 -060023#include <asm/ptrace.h>
wdenk9c53f402003-10-15 23:53:47 +000024#include <command.h>
Simon Glass8e16b1e2019-12-28 10:45:05 -070025#include <init.h>
Simon Glass9b61c7c2019-11-14 12:57:41 -070026#include <irq_func.h>
Mike Frysinger629d88b2010-02-08 15:30:16 -050027#include <kgdb.h>
wdenk9c53f402003-10-15 23:53:47 +000028#include <asm/processor.h>
29
Wolfgang Denk6405a152006-03-31 18:32:53 +020030DECLARE_GLOBAL_DATA_PTR;
31
wdenk9c53f402003-10-15 23:53:47 +000032/* Returns 0 if exception not found and fixup otherwise. */
33extern unsigned long search_exception_table(unsigned long);
34
wdenk492b9e72004-08-01 23:02:45 +000035/*
Becky Bruce306b4e82008-05-14 13:10:04 -050036 * End of addressable memory. This may be less than the actual
37 * amount of memory on the system if we're unable to keep all
38 * the memory mapped in.
wdenk9c53f402003-10-15 23:53:47 +000039 */
Stefan Roesea13a2aa2020-08-12 13:16:36 +020040#define END_OF_MEM (gd->ram_base + get_effective_memsize())
wdenk9c53f402003-10-15 23:53:47 +000041
42static __inline__ void set_tsr(unsigned long val)
43{
44 asm volatile("mtspr 0x150, %0" : : "r" (val));
45}
46
47static __inline__ unsigned long get_esr(void)
48{
49 unsigned long val;
50 asm volatile("mfspr %0, 0x03e" : "=r" (val) :);
51 return val;
52}
53
54#define ESR_MCI 0x80000000
55#define ESR_PIL 0x08000000
56#define ESR_PPR 0x04000000
57#define ESR_PTR 0x02000000
58#define ESR_DST 0x00800000
59#define ESR_DIZ 0x00400000
60#define ESR_U0F 0x00008000
61
Jon Loeliger526e5ce2007-07-09 19:06:00 -050062#if defined(CONFIG_CMD_BEDBUG)
wdenk9c53f402003-10-15 23:53:47 +000063extern void do_bedbug_breakpoint(struct pt_regs *);
64#endif
65
66/*
67 * Trap & Exception support
68 */
69
Kim Phillipse16737f2012-10-29 13:34:29 +000070static void print_backtrace(unsigned long *sp)
wdenk9c53f402003-10-15 23:53:47 +000071{
72 int cnt = 0;
73 unsigned long i;
74
75 printf("Call backtrace: ");
76 while (sp) {
77 if ((uint)sp > END_OF_MEM)
78 break;
79
80 i = sp[1];
81 if (cnt++ % 7 == 0)
82 printf("\n");
83 printf("%08lX ", i);
84 if (cnt > 32) break;
85 sp = (unsigned long *)*sp;
86 }
87 printf("\n");
88}
89
Kim Phillipse16737f2012-10-29 13:34:29 +000090void show_regs(struct pt_regs *regs)
wdenk9c53f402003-10-15 23:53:47 +000091{
92 int i;
93
94 printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
95 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
96 printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
97 regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
98 regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
99 regs->msr&MSR_IR ? 1 : 0,
100 regs->msr&MSR_DR ? 1 : 0);
101
102 printf("\n");
103 for (i = 0; i < 32; i++) {
104 if ((i % 8) == 0)
105 {
106 printf("GPR%02d: ", i);
107 }
108
109 printf("%08lX ", regs->gpr[i]);
110 if ((i % 8) == 7)
111 {
112 printf("\n");
113 }
114 }
115}
116
117
Kim Phillipse16737f2012-10-29 13:34:29 +0000118static void _exception(int signr, struct pt_regs *regs)
wdenk9c53f402003-10-15 23:53:47 +0000119{
120 show_regs(regs);
121 print_backtrace((unsigned long *)regs->gpr[1]);
122 panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
123}
124
Kim Phillipse16737f2012-10-29 13:34:29 +0000125void CritcalInputException(struct pt_regs *regs)
wdenk9c53f402003-10-15 23:53:47 +0000126{
127 panic("Critical Input Exception");
128}
129
Andy Flemingf08233c2007-08-14 01:34:21 -0500130int machinecheck_count = 0;
131int machinecheck_error = 0;
Kim Phillipse16737f2012-10-29 13:34:29 +0000132void MachineCheckException(struct pt_regs *regs)
wdenk9c53f402003-10-15 23:53:47 +0000133{
134 unsigned long fixup;
Andy Flemingf08233c2007-08-14 01:34:21 -0500135 unsigned int mcsr, mcsrr0, mcsrr1, mcar;
wdenk9c53f402003-10-15 23:53:47 +0000136
137 /* Probing PCI using config cycles cause this exception
138 * when a device is not present. Catch it and return to
139 * the PCI exception handler.
140 */
141 if ((fixup = search_exception_table(regs->nip)) != 0) {
142 regs->nip = fixup;
143 return;
144 }
145
Andy Flemingf08233c2007-08-14 01:34:21 -0500146 mcsrr0 = mfspr(SPRN_MCSRR0);
147 mcsrr1 = mfspr(SPRN_MCSRR1);
148 mcsr = mfspr(SPRN_MCSR);
149 mcar = mfspr(SPRN_MCAR);
150
151 machinecheck_count++;
152 machinecheck_error=1;
153
Jon Loeliger526e5ce2007-07-09 19:06:00 -0500154#if defined(CONFIG_CMD_KGDB)
wdenk9c53f402003-10-15 23:53:47 +0000155 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
156 return;
157#endif
158
159 printf("Machine check in kernel mode.\n");
Andy Flemingf08233c2007-08-14 01:34:21 -0500160 printf("Caused by (from mcsr): ");
161 printf("mcsr = 0x%08x\n", mcsr);
162 if (mcsr & 0x80000000)
163 printf("Machine check input pin\n");
164 if (mcsr & 0x40000000)
165 printf("Instruction cache parity error\n");
166 if (mcsr & 0x20000000)
167 printf("Data cache push parity error\n");
168 if (mcsr & 0x10000000)
169 printf("Data cache parity error\n");
170 if (mcsr & 0x00000080)
171 printf("Bus instruction address error\n");
172 if (mcsr & 0x00000040)
173 printf("Bus Read address error\n");
174 if (mcsr & 0x00000020)
175 printf("Bus Write address error\n");
176 if (mcsr & 0x00000010)
177 printf("Bus Instruction data bus error\n");
178 if (mcsr & 0x00000008)
179 printf("Bus Read data bus error\n");
180 if (mcsr & 0x00000004)
181 printf("Bus Write bus error\n");
182 if (mcsr & 0x00000002)
183 printf("Bus Instruction parity error\n");
184 if (mcsr & 0x00000001)
185 printf("Bus Read parity error\n");
186
wdenk9c53f402003-10-15 23:53:47 +0000187 show_regs(regs);
Andy Flemingf08233c2007-08-14 01:34:21 -0500188 printf("MCSR=0x%08x \tMCSRR0=0x%08x \nMCSRR1=0x%08x \tMCAR=0x%08x\n",
189 mcsr, mcsrr0, mcsrr1, mcar);
wdenk9c53f402003-10-15 23:53:47 +0000190 print_backtrace((unsigned long *)regs->gpr[1]);
Andy Flemingf08233c2007-08-14 01:34:21 -0500191 if (machinecheck_count > 10) {
192 panic("machine check count too high\n");
193 }
194
195 if (machinecheck_count > 1) {
196 regs->nip += 4; /* skip offending instruction */
Andrew Klossnere4ad4542008-07-07 06:41:14 -0700197 printf("Skipping current instr, Returning to 0x%08lx\n",
Andy Flemingf08233c2007-08-14 01:34:21 -0500198 regs->nip);
199 } else {
Andrew Klossnere4ad4542008-07-07 06:41:14 -0700200 printf("Returning back to 0x%08lx\n",regs->nip);
Andy Flemingf08233c2007-08-14 01:34:21 -0500201 }
wdenk9c53f402003-10-15 23:53:47 +0000202}
203
Kim Phillipse16737f2012-10-29 13:34:29 +0000204void AlignmentException(struct pt_regs *regs)
wdenk9c53f402003-10-15 23:53:47 +0000205{
Jon Loeliger526e5ce2007-07-09 19:06:00 -0500206#if defined(CONFIG_CMD_KGDB)
wdenk9c53f402003-10-15 23:53:47 +0000207 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
208 return;
209#endif
210
211 show_regs(regs);
212 print_backtrace((unsigned long *)regs->gpr[1]);
213 panic("Alignment Exception");
214}
215
Kim Phillipse16737f2012-10-29 13:34:29 +0000216void ProgramCheckException(struct pt_regs *regs)
wdenk9c53f402003-10-15 23:53:47 +0000217{
218 long esr_val;
219
Jon Loeliger526e5ce2007-07-09 19:06:00 -0500220#if defined(CONFIG_CMD_KGDB)
wdenk9c53f402003-10-15 23:53:47 +0000221 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
222 return;
223#endif
224
225 show_regs(regs);
226
227 esr_val = get_esr();
228 if( esr_val & ESR_PIL )
229 printf( "** Illegal Instruction **\n" );
230 else if( esr_val & ESR_PPR )
231 printf( "** Privileged Instruction **\n" );
232 else if( esr_val & ESR_PTR )
233 printf( "** Trap Instruction **\n" );
234
235 print_backtrace((unsigned long *)regs->gpr[1]);
236 panic("Program Check Exception");
237}
238
Kim Phillipse16737f2012-10-29 13:34:29 +0000239void PITException(struct pt_regs *regs)
wdenk9c53f402003-10-15 23:53:47 +0000240{
241 /*
242 * Reset PIT interrupt
243 */
244 set_tsr(0x0c000000);
245
246 /*
247 * Call timer_interrupt routine in interrupts.c
248 */
249 timer_interrupt(NULL);
250}
251
Kim Phillipse16737f2012-10-29 13:34:29 +0000252void UnknownException(struct pt_regs *regs)
wdenk9c53f402003-10-15 23:53:47 +0000253{
Jon Loeliger526e5ce2007-07-09 19:06:00 -0500254#if defined(CONFIG_CMD_KGDB)
wdenk9c53f402003-10-15 23:53:47 +0000255 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
256 return;
257#endif
258
259 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
260 regs->nip, regs->msr, regs->trap);
261 _exception(0, regs);
262}
Scott Woode957bd72009-08-20 17:45:00 -0500263
Kim Phillipse16737f2012-10-29 13:34:29 +0000264void ExtIntException(struct pt_regs *regs)
Andy Flemingf08233c2007-08-14 01:34:21 -0500265{
Kim Phillips2ecbfeb2010-08-09 18:39:57 -0500266 volatile ccsr_pic_t *pic = (void *)(CONFIG_SYS_MPC8xxx_PIC_ADDR);
Kumar Gala0a7a0972007-11-29 02:10:09 -0600267
Andy Flemingf08233c2007-08-14 01:34:21 -0500268 uint vect;
269
270#if defined(CONFIG_CMD_KGDB)
271 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
272 return;
273#endif
274
275 printf("External Interrupt Exception at PC: %lx, SR: %lx, vector=%lx",
276 regs->nip, regs->msr, regs->trap);
277 vect = pic->iack0;
Andrew Klossnere4ad4542008-07-07 06:41:14 -0700278 printf(" irq IACK0@%05x=%d\n",(int)&pic->iack0,vect);
Andy Flemingf08233c2007-08-14 01:34:21 -0500279 show_regs(regs);
280 print_backtrace((unsigned long *)regs->gpr[1]);
Andy Flemingf08233c2007-08-14 01:34:21 -0500281}
wdenk9c53f402003-10-15 23:53:47 +0000282
Kim Phillipse16737f2012-10-29 13:34:29 +0000283void DebugException(struct pt_regs *regs)
wdenk9c53f402003-10-15 23:53:47 +0000284{
285 printf("Debugger trap at @ %lx\n", regs->nip );
286 show_regs(regs);
Jon Loeliger526e5ce2007-07-09 19:06:00 -0500287#if defined(CONFIG_CMD_BEDBUG)
wdenk9c53f402003-10-15 23:53:47 +0000288 do_bedbug_breakpoint( regs );
289#endif
290}